Dear all,

This refers to UG-99(h),

wherein code recommends to have difference of 17 degree C in hydrotest liquid temperature & MDMT.

here I would like to know that it is refered as rated MDMT or
Equipment MDMT.

I have case wherein my Equipment MDMT is 16 deg.C

Shall I increase temperature of water to 16 + 17 = 33 Deg C if water is at 25 deg.C.I know it is just recommendation not mandatory.

Or I can consider rated MDMT here.

Please share or views on that.

Hi Mitul,
This is just a recommended value for Div. 1 (mandatory for div. 2)in order to avoid the brittle fracture. Check the temperature at which the material is impact tested and take the decision based on code\client specifications.